Slaves were brought from the west coast of Africa to the New World. US History I - Midterm Review. Vocabulary for US History I - Midterm Review. Find, create, and access US History I, The Federalist Papers, flashcards with Course Hero.
Breathing is an involuntary process that is controlled by the medulla and pons of the brain stem. The frequency of normal, involuntary breathing is controlled by three groups of neurons or brain stem centers: the medullary respiratory center, the apneustic center, and the pneumotaxic center.owever, if alveolar Po2 is 60 mm Hg, then arterial blood will have a Po2 of 60 mm Hg, in which case the hypoxemia is severe enough to stimulate peripheral chemoreceptors in the carotid and aortic bodies. In turn, the chemoreceptors instruct the medullary inspiratory center to increase the breathing rate.
The response is that the respiratory centre (in the medulla), sends nervous impulses to the external intercostal muscles and the diaphragm, via the intercostal nerve and the phrenic nerve, respectively, to increase breathing rate and the volume of the lungs during inhalation.here are two main classes of the chemosensor: direct and distance. 1  Examples of distance chemoreceptors are: 2  olfactory receptor neurons in the olfactory system: Olfaction involves the ability to detect chemicals in the gaseous state.